I replaced mine last year. The turbo heats up those plastic lines and makes them so brittle they crack. I ended up replacing with rubber line and nozzles from the auto store.
But to answer your question, they are just plastic rivets. There is a special tool to remove them, or you can just use needle nose if you are careful enough.
'08 WK CRD
Eibach Sport Suspension
20" SRT Rims